高等学校化学学报 ›› 2017, Vol. 38 ›› Issue (8): 1436-1441.doi: 10.7503/cjcu20160925

• 物理化学 • 上一篇    下一篇

锂离子电池正极材料Li2FeSiO4/C的冻干干燥法制备及电化学性质

张冬1, 李浩鸣1, 邱海龙1, 陈岗1, 岳惠娟2, 刘安华2,3   

  1. 1. 吉林大学物理学院, 新型电池物理与技术教育部重点实验室, 长春 130012;
    2. 吉林大学化学学院, 无机合成与制备化学国家重点实验室, 长春 130012;
    3. 厦门大学材料学院, 高性能陶瓷纤维教育部重点实验室, 厦门 361005
  • 收稿日期:2016-12-22 修回日期:2017-07-17 出版日期:2017-08-10 发布日期:2017-07-17
  • 通讯作者: 岳惠娟,女,博士,副教授,主要从事功能材料研究.E-mail:huijuan@jlu.edu.cn E-mail:huijuan@jlu.edu.cn
  • 基金资助:

    吉林省科技厅科技发展计划项目(批准号:20150204030GX)、吉林省自然科学基金(批准号:20160101320JC)和厦门大学高性能陶瓷纤维教育部重点实验室开放课题(批准号:201602)资助.

Freeze-drying Synthesis and Characterization of Li2FeSiO4/C Cathode Materials for Lithium Ion Batteries

ZHANG Dong1, LI Haoming1, QIU Hailong1, CHEN Gang1, YUE Huijuan2, LIU Anhua2,3   

  1. 1. Key Laboratory of Physics and Technology for Advanced Batteries, Ministry of Education, College of Physics, Jilin University, Changchun 130012, China;
    2. State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, Changchun 130012, China;
    3. Key Laboratory of High Performance Ceramic Fibers of Ministry of Education, College of Materials, Xiamen University, Xiamen 361005, China
  • Received:2016-12-22 Revised:2017-07-17 Online:2017-08-10 Published:2017-07-17
  • Supported by:

    Supported by the Science and Technology Development Planning of Jilin Province, China(No.20150204030GX), the Natural Science Foundation of Jilin Province, China(No.20160101320JC) and the Open Fund of Key Laboratory of High Performance Ceramic Fibers, Ministry of Education, Xiamen University, China(No.201602).

摘要:

通过冻干干燥法辅助制备了分布均匀的纳米Li2FeSiO4材料.通过X射线衍射(XRD)、拉曼光谱(Raman)、扫描电子显微镜(SEM)、N2吸附-脱附、循环伏安(CV)和充放电测试等手段对材料的结构及电化学性能进行了表征.结果表明,冻干法处理后得到的Li2FeSiO4材料颗粒尺寸更小,能够缩短锂离子的扩散距离;同时较大的比表面积可以使材料与电解液接触更加充分.在1.5~4.8 V电压范围内,与采用传统烘干干燥法制备的材料相比,采用冻干法制备的材料表现出更高的可逆比容量,并具有良好的倍率性能和循环稳定性.

关键词: 锂离子电池, 正极材料, 硅酸亚铁锂, 冻干法, 锂离子电池, 正极材料, 硅酸亚铁锂, 冻干法

Abstract:

Li2FeSiO4/C nanocomposites were prepared by freeze-dying synthesis. X-ray diffraction, Raman spectrometry, field emission scanning electron microscopy and N2 adsorption-desorption were used to investigate the effect of dry method on the physical characteristics of Li2FeSiO4/C. The results show that Li2FeSiO4 obtained by freeze-drying method(DG) exhibits smaller particle size and larger specific surface area. The electrochemical performance was studied by galvanostatic charge-discharge and electrochemical impedance spectra. Compared to the Li2FeSiO4 obtained by ordinary drying method(HG), DG exhibits better rate capability, and the discharge capacity of 106.7 mA·h/g can be achieved at 2C rate.

Key words: Lithium ion battery, Cathode material, Li2FeSiO4, Freeze-drying, Lithium ion battery, Cathode material, Li2FeSiO4, Freeze-drying

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